<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Login</title>
</head>
<body>
<form action="login" method="post">
    账 户：<input type="text" name="username"><br>
    密 码：<input type="password" name="pwd"><br>
    <button type="submit">登录</button>
</form>
<a href="welcome">测试：未登录则重定向回本页</a>

</body>
</html>